Net Loss Per Share

Basic net loss per share is computed by dividing net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. The weighted-average number of shares of common stock outstanding does not include any potentially dilutive securities or unvested restricted stock. Unvested restricted stock, although classified as issued and outstanding at March 31, 2018 and 2017, is considered contingently returnable until the restrictions lapse and will not be included in the basic net loss per share calculation until the shares are vested. Unvested restricted stock does not contain non-forfeitable rights to dividends and dividend equivalents. Unvested RSUs are not included in calculations of basic net loss per share, as they are not considered issued and outstanding at time of grant.

Diluted net loss per share is computed by giving effect to all potential shares of common stock, including stock options, preferred stock, RSUs, and unvested restricted stock, to the extent they are dilutive. For the three months ended March 31, 2018 and 2017, all such common stock equivalents have been excluded from diluted net loss per share as the effect to net loss per share would be anti-dilutive (decrease our net loss per share).

The following table sets forth the computation of the Company’s basic and diluted net loss per share (in thousands, except per share data):



	Three Months Ended March 31,
	2018			2017
Numerator:
Net loss	$	(1,285	)	$	(668	)
Less: preferred stock dividends	3			3
Net loss attributable to common stockholders	$	(1,288	)	$	(671	)
Denominator:
Weighted-average number of shares of common stock for basic and diluted net loss per share	46,232			36,181
Basic and diluted net loss per share	$	(0.03	)	$	(0.02	)

The weighted-average number of shares for the three months ended March 31, 2018 and 2017 includes 988,000 and 517,000 shares of vested RSUs, respectively, as discussed in Note 8.

The following table represents the potential shares that were excluded from the computation of weighted-average number of shares of common stock in computing the diluted net loss per share for the periods presented because including them would have had an anti-dilutive effect (in thousands):



	Three Months Ended March 31,
	2018	2017
Unvested restricted stock units	742	2,938
Unvested restricted stock awards	113	354
Outstanding stock options	1,192	1,222
Shares of common stock issuable upon conversion of Series A-2 Preferred	79	79
Shares of common stock issuable upon conversion of Series B Preferred	1,339	—
Shares of common stock issuable upon conversion of Series C Preferred	4,250	—